# OpenAI — Introducing GPT-6 Sol and Luna

- Company: OpenAI (openai.com)
- Announced: 2026-09-22T18:00:00+00:00
- Category: new-model
- Coverage: 18 outlets
- Announcement: yes
- Group: models
- Source: https://openai.com/index/introducing-gpt-6-sol-and-luna
- Record: https://forck.live/items/13114-introducing-gpt-6-sol-and-luna
- Subject: GPT / ChatGPT / API
- Models affected: GPT-6 Sol, GPT-6 Luna
- Pricing: GPT‑6 Sol vs. GPT‑5.6 Sol: Input $4 → $2, Output $20 → $10, 50% cheaper. GPT‑6 Luna vs. GPT‑5.6 Luna: Input $0.20 → $0.10, Output $1.20 → $0.50, 50% cheaper. Prices are per 1 million tokens.

OpenAI announced GPT-6 Sol and GPT-6 Luna, two new models in the GPT-6 family that offer improved cost efficiency while bringing advances from GPT-6 Astra to professional work, factuality, coding, and alignment. API prices for Sol and Luna are reduced by 50% compared to their GPT-5.6 promotional pricing. The models outperform similarly priced competitors on benchmarks such as AutomationBench, Agents' Last Exam, FrontierCode, and DeepSWE at lower cost per task.

## Evidence

Verbatim from https://openai.com/index/introducing-gpt-6-sol-and-luna:

> We trained GPT‑6 Sol and Luna with similar methods as GPT‑6 Astra, bringing the advances behind Astra’s state-of-the-art performance in professional work, factuality, coding, computer use, and alignment to faster, more affordable models.

## Around this story

Outlets this record can name and link:

- ZDNET — OpenAI's GPT-6 Sol doubles its accuracy rate - for half the cost: https://zdnet.com/innovation/openai-gpt-6-sol-luna-release
- The Decoder — OpenAI's GPT-6 Sol and Luna cut prices in half but barely move the needle on performance: https://the-decoder.com/openais-gpt-6-sol-and-luna-cut-prices-in-half-but-barely-move-the-needle-on-performance
- The Economic Times — OpenAI expands GPT-6 lineup with cheaper Sol and Luna models: https://economictimes.indiatimes.com/tech/technology/openai-expands-gpt-6-lineup-with-cheaper-sol-and-luna-models/articleshow/134418905.cms
- The New Stack — GPT-6 Sol closes most of the alignment gap with Astra. It's one-fifth the price.: https://thenewstack.io/gpt-sol-alignment-gaps
- 9to5Mac — OpenAI upgrading ChatGPT and Codex with two more GPT-6 models: https://9to5mac.com/2026/09/22/openai-upgrading-chatgpt-and-codex-with-two-more-gpt-6-models
- Unite — OpenAI Introduces GPT-6 Sol and Luna With 50% Lower API Prices: https://unite.ai/openai-introduces-gpt-6-sol-and-luna-with-50-lower-api-prices
- RuntimeWire — OpenAI launches GPT-6 Sol and Luna with sharply lower API prices: https://runtimewire.com/article/openai-gpt-6-sol-luna-launch
- Neowin: https://neowin.net/news/openai-launches-gpt-6-sol-and-luna-with-improved-intelligence-at-lower-prices
- Yahoo Finance — OpenAI Launches GPT-6 Sol and Luna Minutes After Anthropic Drops Claude Opus 5.5: https://finance.yahoo.com/technology/ai/articles/openai-launches-gpt-6-sol-190038195.html
- iPhone in Canada — OpenAI’s New GPT-6 Sol and Luna Models Are 50% Cheaper: https://iphoneincanada.ca/2026/09/22/openai-gpt-6-sol-luna-launch-price
- Digit — OpenAI launches GPT 6 Sol and Luna with Astra-level AI at lower cost, check details: https://digit.in/news/general/gpt-6-astra-gets-two-new-siblings-openai-launches-sol-and-luna-with-lower-costs.html
- Pulse 2.0 — OpenAI Launches GPT-6 Sol And Luna With 50% Lower API Pricing: https://pulse2.com/openai-launches-gpt-6-sol-and-luna
- Finimize: https://finimize.com/content/openai-rolls-out-cheaper-gpt-6-models-for-everyday-work
- Ithinkdiff — GPT-6 Sol and Luna Launch With 50% Lower Prices Than GPT-5.6: https://ithinkdiff.com/openai-launches-gpt-6-sol-and-luna-with-50-percent-lower-prices
- XDA Developers — OpenAI returns fire against Anthropic's Opus 5.5 with better, cheaper GPT-6 models: https://xda-developers.com/openai-returns-fire-against-anthropics-opus-55-with-better-cheaper-gpt-6-models
- Constellation Research — OpenAI adds GPT-6 Luna and Sol, touts lower prices: https://constellationr.com/insights/news/openai-adds-gpt-6-luna-and-sol-touts-lower-prices

## Follow-ups

- TechCrunch (reported, 22 Sep): OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakes — https://forck.live/items/13109-openai-launches-gpt-6-sol-and-luna-boasting-lower-cost-and-fewer-mistakes
- TestingCatalog (reported, 22 Sep): OpenAI prepares to launch GPT-6 Sol and Luna models today — https://forck.live/items/13039-openai-prepares-to-launch-gpt-6-sol-and-luna-models-today

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